Both Mark Riddell and Chad Robinson will be sidelined for between 4 and 6 weeks after x rays confirmed fractures. Riddell has a fracture to his thumb while for Robinson the break is to his hand.

Eels coach Michael Hagan says the injuries are a blow but there is also some good news.

"We've been in pretty good shape so far and we are hopeful of getting back Nathan Cayless, Timana Tahu, Brett Finch and also Fuifui Moimoi so that may compensate for those couple being out," Hagan told www.parraeels.com.au.

"The Panthers performance against the Titans on the weekend was disappointing so they will be very fired up against Parramatta on Friday night," Hagan added.